Millions of Americans are gearing up for a challenging allergy season in 2026, with periods of high pollen forecast to hit within weeks. Tree pollen season has already begun in the South and southwest—across parts of California, Arizona and much of the Gulf Coast—according to AccuWeather. The Ohio Valley is also expected to be one of the hardest-hit regions by mid-April, affecting millions of people across 11 states. Exposure to pollen can trigger different allergic reactions, including hay